THIN and LONG body of fresh water
A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases a river flows into the ground and becomes dry at the end of its course without reaching another body of water.
More than half a percent of Earth’s nonglaciated land surface – about 773,000 km2 – is covered with rivers and streams
Rivers could be a possible impact point due to rising sea levels